ZD25WD20CEIGR from Zetta, in a USON-8(2x3). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	CS#	input	Chip Select input (active low). Drive low to select the device and enable command/data transfer; drive high to deselect and place SO in High-Z.
2	SO/IO1	bidirectional	Serial Data Output in standard SPI mode; becomes bidirectional data line IO1 during Dual SPI operations (Dual Output Fast Read 3BH, Dual I/O Fast Read BBH, DREMS 92H).
3	NC	unconnected	No connection. May be left floating or tied to ground.
4	VSS	power_in	Ground reference for all supply and signal pins.
5	SI/IO0	bidirectional	Serial Data Input in standard SPI mode; becomes bidirectional data line IO0 during Dual SPI operations. All commands, addresses, and data-in are shifted in MSB-first on the rising edge of SCLK.
6	SCLK	input	Serial Clock input. Supports SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1). Input data is latched on the rising edge and output data is shifted on the falling edge. Max 104MHz single-I/O fast read.
7	NC	unconnected	No connection. May be left floating or tied to ground.
8	VCC	power_in	Power supply input, 1.65V to 3.6V. Typical currents: 1.3mA active read at 33MHz, 3.2mA active program/erase, 0.5uA standby, 0.3uA deep power-down.

Key specifications

Parameter	Value
Manufacturer	Zetta
Package	USON-8(2x3)
Category	Memory
Pins	8

Ordering variants

Same part, different packaging or reel option.

ZD25WD20CEIGR
ZD25WD20CEIGREIGT
ZD25WD20CEIGREIGY
ZD25WD20CEIGREEGR
ZD25WD20CEIGRTIGR
ZD25WD20CEIGRTEGR
ZD25WD20CEIGRTIGT
ZD25WD20CEIGROIGR
ZD25WD20CEIGROEGR
ZD25WD20CEIGRKIGR
ZD25WD20CEIGRKEGR
ZD25WD20CEIGRJIGR
ZD25WD20CEIGRJEGR
ZD25WD20CEIGRFIGR
ZD25WD20CEIGRFEGR

CAD (KiCad official)

Symbol: ZD25WD20CEIGR
Footprint: Package_SON:Winbond_USON-8-1EP_3x2mm_P0.5mm_EP0.2x1.6mm
3D model: USON-8(2x3) (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`zd25wd20ceigr.step`	106 KB	You want the bare part, or you mark your own boards.
`zd25wd20ceigr-etched.step`	2.2 MB	You want the part with `ZD25WD20CEIGR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 560 faces against 62 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Zetta datasheet (40 pp, sha256 114863a3cfb6032a, retrieved 2026-08-17, tier: lcsc)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF